nichols



(No Model.)

J. B. F. HBRRESHOFF.

FIRE DOOR POR FURNAGES- No. 342,511. Patented May 25, 1 886.

Arron/v5@ N. PETERS. VlwofLilr-ognphor. Washington, D. C.

V UNITED STATES PATENT OFFICE.

i JOHN BROVN FRANCIS HERRESHOFF, OF BROOKLYN, .EW YORK, ASSIGNOR TO HIMSELF, GEORGE H. NIGHOLS,'AND WILLIAM NICHOLS, ALL OF SAME PLACE.

FIRE-DOOR FOR FURNACES.

SPECIFICATION forming part of Letters Patent No. 342,511, dated May 25, 1886.

Application filed March 13, 1886. Serial No. 195,063. (No model.)

T0 all whom t may concern:

Be it known that I, JOHN BROWN FRANcIs HEREEsrIoEF, ofthe city of Brooklyn, in the county of Kings and State of New York, have 5 invented an Improved Fire-Door for Furnaces,

8mo.. of which the following is a complete specification, reference being had to the accompanying drawings, in Which*- Figurel is a face view of myilnproved reio door. Fig. 2 is a horizontal section; Fig. 3,

a vertical section of the same; and Fig. 4 is a vertical section of a modiiication thereof.

This invention relates to improvements on fire-doors for furnaces of all kinds, its object i5 being to prevent the rapid destruction of the door by the heat of the furnace.

The invention consists in a peculiar construction of lining for the inner side of the fire-door, as hereinafter described. A

In the drawings, the letter A represents the outer metal body or face-piece of the tire-door, which may be of suitable form and thickness. On the inner side this door hasiuwardly-projecting parallel ribs a a, each of which is silbz5 stantially T-shaped in cross-section, asin Fig.

2. The T- heads at the inner ends oi' these ribs c c serve to receive and hold in place blocks B B, ofiire-brick or analogoussubstance. These blocks are grooved at their edges to tit the 3c ribs a a, and are substantially contiguous along the inner face of the door-that is to say, they lap over the T- heads ot' the ribs c c, so as to meet at b behind side ribs. These blocks or bricks B B can be slid into position from 35 above, as in Fig. 3, so as to rest on a ledge or shoulder, d, which is formed for this purpose on the lower portion of the` door.

rIhe letters C O represent the doo1-i'rame or the body ofthe furnace.

It will be perceived from au inspection of Figs. 2 and 3 that the blocks or bricks B B are by the ribs o a held at a distance from the metal body of the door A, so as to leave an air-space, e, between, which, by an aperture or otherwise, may communicate with the interior of the furnace and with the outer atmosphere. The bricks B B thus protect the metal of the door from the direct and destructive iniluence of the heat of the furnace, and they likewise protect the ribs a a, that hold them from direct contact with the heated gases. 'Being in sections, these bricks are not liable to warp or crack, asis the case with the continuous linings that have been already suggested for the inner faces of tire-doors; but even if one or more of these bricks should become destroyed by the heat it can easily be taken out and replaced by another.

I have shown the invention applied to a firedoor; but it is quite evident that it is applicable also to other parts of furnaces which require protection from the effect of great heat.

The modification which is shown in Fig. 4 consistsin inserting each brick or block B from below instead of from above, as in Fig. 3, the upper edge of the brick or block B resting against the lip g, that extends inwardly from the door, while the lower end of each brick or block is supported on the ledge d, which in this modification is made detachable, being fastened to the door A by suitable bolt-s.

I claim- The fire door or plate A, having T- shaped upright ribs a a, and ledge d at right angles to said ribs, in combination with the bricks or blocks B B, which are held between said ribs, overlapping the same, and rested on said ledge at a distance from said plate A, as specitied.

JOHN BROWN FRANCIS IIERRESHOFF.

XVitiiesses:

C. II. JoiiE'r, l. NAFIs. 

